Built for Windows 10 & 11

Translate any text
on your screen.
Instantly.

Select any area in any Windows app. Trelli recognizes the text locally and places the translation right where you need it—without copying or switching tabs.

Download for Windows ↓View the app
✓ One-time purchase✓ Local OCR✓ No ads
Trelli · Custom AIWINDOWS
Trelli Custom AI and OCR settings
01
OCR stays localYour screenshot never leaves the PC
⌨
Your shortcut, your choiceSet any global key combination
● READY TO TRANSLATE
LOCAL OCRNO SUBSCRIPTIONBRING YOUR OWN AICUSTOM SHORTCUT
USE IT ANYWHERE

Stay in the moment.
Understand what you see.

Trelli works where the text already lives—inside articles, documents, videos, creative tools, and games.

A Japanese travel article translated directly on a Windows laptop
READ WITHOUT INTERRUPTION

From unfamiliar text
to clear meaning.

Select it. Read it. Keep going.

WEBArticles↗
DOCPDFs▤
PLAYVideos▶
LIVEGames✦
ONE COMPACT CONTROL PANEL

Simple by default.
Flexible when needed.

Choose your languages, OCR engine, display style, and preferred translation provider—including your own AI model.

Local OCRCustom AIYour shortcut
Trelli settingsREAL SCREENSHOT
Trelli language, engine and display settings
HOW IT WORKS

Three seconds.
Three small moves.

Trelli stays out of your way until the moment you need it.

01
⌨

Use your shortcut

Choose a global key combination that fits the way you work.

02
⌗

Select any area

Drag over text in a browser, PDF, video, app, or game.

03
文

Read it in place

The translation appears over the original layout. Click once to compare.

BUILT FOR FOCUS

Translation without
breaking your flow.

ON-DEVICE

Your screenshot stays local.

RapidOCR, Windows OCR, and Tesseract recognize text on your PC. Only recognized text is sent to your selected translation provider.

LOCALOCR
◎

In-place results

Layout-aware rendering keeps the translation close to the original design.

↯

Built-in fallback

Free services can switch automatically when one is temporarily unavailable.

CUSTOM AIendpoint /chat/completionsmodel your-modelapi_key ••••••••••••
NEW

Bring your own AI model.

Connect an OpenAI-compatible endpoint for higher-quality translation. Your key is encrypted for your Windows account.

DOWNLOAD & PRICING

Pay once. Keep it.

No account inside the app. No ads. No surprise renewal.

LAUNCH PRICE

Trelli for Windows

$1.99

One-time purchase · current version

  • Ready-to-run Windows x64 app
  • Local multi-engine OCR
  • Free translation fallback
  • Custom AI endpoint support
  • Personal use license
Download installerEnter your license key in the installer to continue.
FOR DEVELOPERS

Private Source Package

$14.99

One-time purchase · current version

  • Complete C# / WPF source code
  • Build and publishing scripts
  • Private ZIP or GitHub access
  • Modify for your own projects
  • Commercial source license
Source link coming soonResale and public redistribution are not included.
GOOD TO KNOW

Honest answers.

Does Trelli upload my screenshots?+

No. OCR runs locally. Only recognized text is sent to the translation provider you choose.

Does translation work offline?+

Recognition can run locally, but translation needs internet unless you connect a compatible local AI service.

What does lifetime mean?+

The $1.99 purchase gives permanent use of the version you buy. The update policy will be stated before launch.

Can I redistribute the source code?+

No. Public sharing, resale, and redistribution require separate written permission.

LESS FRICTION. MORE READING.

Your screen speaks
your language now.

Download Trelli for Windows ↓